"The Doppler radar in Portland detected winds moving north right next to a pocket of winds moving south.

Those are the 'couplets,' or circulation areas we look for to detect tornadoes.

"Unfortunately, the circulation formed and dissipated so quickly -- within just a few minutes -- so there was no time for the National Weather Service to issue a tornado warning for the area before the storm had come and gone."

No injuries have been reported.

The National Weather Service in Portland said it has a survey team looking at the damages.